<script type="text/javascript" src="{{ asset('js/jquery-1.8.2.min.js') }}"></script>

<form method="post" id="payment-form" action="http://test.robokassa.ru/Index.aspx">
    <!-- для реального режима измените action формы на "https://merchant.roboxchange.com/Index.aspx" -->

    <input type="hidden" name="MrchLogin" value="{{ login }}" />
    <input type="hidden" name="OutSum" value="{{ amount }}" />
    <input type="hidden" name="InvId" value="{{ oderId }}" />
    <input type="hidden" name="Desc" value="Покупка носков" />
    <input type="hidden" name="SignatureValue" value="{{ signature }}" />

</form>
<script type="text/javascript">
    $().ready(function() {
        $('#payment-form').submit();
    });
</script>